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HTTP Header Parser

Parse raw request or response headers into a readable table, inspect common auth and caching fields, and keep duplicate headers visible. Useful for API debugging, curl output, and browser DevTools traces.

HTTP header parser

Turn raw headers into structured output

Paste request or response headers from curl, DevTools, logs, or an API client. Duplicate headers stay visible instead of getting flattened.

Parsed request

Header table

Add one header per line in the format Name: value.

Debugging cues

What stands out

Common headers like Authorization, Content-Type, Cache-Control, and Set-Cookie will be highlighted here.

Next best tools

Where to go after parsing headers

Headers usually point you toward the next layer: auth, encoding, or URL debugging.

JWT Decoder & Inspector

Decode a Bearer token from the Authorization header and check claims like exp or aud.

Base64 Encode / Decode

Useful for Basic Auth values, encoded cookies, or other header payloads that are packaged as Base64.

URL Parser & Inspector

Inspect callback, Location, or redirect URLs referenced by the request or response.

How to use this HTTP header parser

  1. Paste raw request or response headers exactly as you copied them from logs, curl, or DevTools.
  2. Review the start line if present, then inspect the parsed header table.
  3. Check the highlight cards for high-signal headers like Authorization, Content-Type, Cache-Control, and Set-Cookie.
  4. Copy the JSON output if you want a cleaner structure for debugging notes or tests.

Why raw headers are worth parsing

Headers often explain request behavior faster than the body does. A bad auth scheme, the wrong `Content-Type`, a stale `Cache-Control` value, or repeated `Set-Cookie` headers can reveal the issue before you inspect a payload at all.

The problem is that raw header blocks are noisy. They come from terminal output, browser panels, or backend logs with little structure. Turning them into a normalized view makes it easier to see what is duplicated, missing, or inconsistent.

This tool is especially useful when debugging auth handoffs, caching bugs, proxy behavior, and cookie-related session issues.

Features

  • Parses request lines, status lines, and raw headers
  • Preserves duplicate headers in the table and JSON output
  • Highlights common debugging headers automatically
  • Supports curl, browser, and log-style pasted input
  • Copies normalized JSON with one click
  • Runs entirely client-side for private traces

Frequently Asked Questions

? Can I paste request or response headers?
Yes. The parser accepts either style. If the first line looks like a request line or HTTP status line, it is kept separately as the start line.
? How are duplicate headers handled?
Duplicate headers stay visible in the table output and become arrays in the JSON view. This is especially useful for `Set-Cookie` and repeated cache directives.
? Does this parse the body too?
No. This tool focuses on the header layer only. It is designed to make raw request and response metadata easier to inspect.
? Is this safe for sensitive auth headers?
Yes. Raw headers are parsed locally in your browser. Nothing is transmitted to the server.

Guides That Support This Tool

Short reference content for the workflows and concepts behind this utility.

Workflow ->

How to Read Raw HTTP Headers While Debugging APIs

A practical workflow for turning a noisy header block into actionable debugging clues.

Workflow ->

Auth Debugging Workflows for JWTs, Headers, and Token Expiry

Start here when auth bugs span JWT claims, token generation, headers, and expiry windows.

Workflow ->

URL and Request Debugging Workflows for Redirects, Params, and Headers

Use this guide when a request bug spans the URL, query string, redirect chain, and headers.